The funky underground sport involving a bouncy ball and a flat surface. Bonus points awarded for random haltings of the game. (ie stuck in a shoe, stopped by a sink, burried in cat food..etc.)Served with the palm of the hand and the wild cry of any asian word; (Bonsai!, sushi!, Tea Bag!)
The ball is then vollied by a series of strange slaps and occasional catches. A kick is not prohibited, nor is it reccomended.

"So I threw my back out playing a rousing round of ball slap last night."

When one guy backhands another guy in the balls with such force that it causes extreme pain. This is done for fun and for laughs as to watch the person in major pain on there knees holding there balls. It's not funny when done to you but it's funny as hell when done to someone else.

I ball slapped tom so hard that that he was on his knees for 20 minutes and i laughed so hard at his pain.